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Thread: Spark plugs

  1. #1

    Default Spark plugs

    I have a 1998 gmc k2500 , 7.4 l , best vehicle i have ever owned ( i'm 70 ) looking for advice on which spark plugs to use, leaning towards gm delco. Thank you

  2. #2

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    Generally considered the best choice for that engine, despite many people screaming about oem parts the one fact they never think about when oem parts fail is how many miles did you get before failure? They normally just allow the fact it failed to influence their decision while many times the parts have served a fair amont of time/miles.

  3. #3

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    Stick with AC Delco, you don't need to change.
    Last edited by The_Duke; 09-12-2013 at 01:34 PM.

  4. #4

    Default

    Quote Originally Posted by tbplus10 View Post
    Generally considered the best choice for that engine, despite many people screaming about oem parts the one fact they never think about when oem parts fail is how many miles did you get before failure? They normally just allow the fact it failed to influence their decision while many times the parts have served a fair amont of time/miles.
    Agreed! Stick with the AC Delco that came in it. Now reason to switch to a "fancy" plug. I let the guys at autozone convince me one time to put autolite plugs in my 2002 5.3L silverado. It ran like crap, it idled rough. I left them in for a week. Then I could not stand it anymore. I put the ac delco in and it ran smoother than ever. I returned the autolite plugs and the guys at the counter looked at them, said that they looked fine. Nothing wrong with them. As I was talking to a manager another guy walked in to return his autolite plugs because he said that his sierra ran poorly after installing them. I am not saying that autolite are bad plugs. They just did not make my truck run well. Why not put what the manufacturer wanted back in.

    1995 Silverado 4x4
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  5. #5
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    I agree with everyone else. They are good for 100,000 miles
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  6. #6

    Default

    Seems these run best with AC Delco. Just as a interesting side note. When I pulled my factory plugs to change out they had ac delco on one side and NGK on the other.
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
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  7. #7

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    Delco or NGK
    Chuckie!!!


  8. #8

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    AC Delco plugs would be my choice. I'm big on OEM stuff as OEM stuff usually performs the best.

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  9. #9

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    I put my plugs through 196,000 miles and replaced them with Delcos so I think the stock plugs do best.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
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  10. #10
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    One more for AC Delco
    2011 Chevy Silverado 3500HD, Dmax/Allison, Taupe Gray Metallic, Line-x over the Rail & Rockers, S&B Intake, Banks Monster Exhaust, Rigid Dually D2's, Cognito Leveling Kit, Cognito Steering Braces plus much more.

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